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Model of 16G3 with d-Trp-Gly-Phe-Pro-Gly-Phe·p-nitrophenyl ester (8a) showing binding pockets (Left) and key contacts (Right). The amino terminus (dark blue sphere) is about 3.5 Å from the electrophilic carbon of the ester (yellow sphere), generating an optimal trajectory for ring closure.
